Definitions for "Henry's Law"
the greater the partial pressure of a gas, the greater the diffusion of the gas into the liquid.
at a given temperature the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid.
Henry's law constant. Henry's law predicts that the solubility (C) of a gas or volatile substance in a liquid is proportional to the partial pressure (P) of the substance over the liquid: P = k C where k is called the Henry's law constant and is characteristic of the solvent and the solute.